(19)

(11)

EP 2 569 972 A1

(12)

(43) Date of publication: 20.03.2013 Bulletin 2013/12 (21) Application number: 11721169.8 (22) Date of filing: 04.05.2011

(51) International Patent Classification (IPC):  H04W 24/10(2009.01) H04W 72/12(2009.01) H04W 76/04(2009.01) (86) International application number: PCT/US2011/035214 (87) International publication number: WO 2011/143035 (17.11.2011 Gazette 2011/46)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 13.05.2010 US 779907 (71) Applicant: Apple Inc. Cupertino, CA 95014 (US)	(72) Inventors: SHI, Jianxiong Cupertino, California 95014 (US) XING, Longda Cupertino, California 95014 (US) (74) Representative: Rooney, John-Paul  Withers & Rogers LLP 4 More London Riverside London SE1 2AU London SE1 2AU (GB)